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Mod 6 > General > Flashcards

General Flashcards

1
Q

Definition of density

A

Measure of mass per volume unit

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2
Q

Unit of density

A

kg/m^3

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3
Q

Definition of fatigue

A

Cracking due to repeated cyclic loading over time

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4
Q

Definition of elasticity

A

The material returning to its original shape after the deforming force is removed

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5
Q

Definition of strength

A

Resistance to deformation or how much stress can be withstood before breaking.

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6
Q

Definition of hardness

A

Resistance to penetration, wear or cutting actions

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7
Q

Definition of plasticity

A

Allows a material to be reshaped and keep it.

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8
Q

Definition of ductility

A

Allows a material to be stretched into thinner sections without breaking

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9
Q

Definition of Malleability

A

Allows the material to be stretched or shaped by force without breaking

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10
Q

Definition of toughness

A

Ability to be deformed without breaking

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11
Q

Definition of brittleness

A

Resistance to change of shape

Ability to break when hammered or deformed

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12
Q

Definition of conductivity

A

Ability to transmit heat or electricity

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13
Q

Definition of durability

A

Ability to withstand forces over time

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14
Q

What are the 3 stresses?

A

Tensile
Compressive
Shearing

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15
Q

Definition of tensile strength

A

Stretching forces that result in stress

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16
Q

Definition of compressive stress

A

Stress created by forces trying to squash/shorten an object

17
Q

Definition of shearing stresses

A

Stresses created by shearing forces

18
Q

Combined stresses combinations?

A

Tensile and shearing

Compressive and shearing

19
Q

What is simple stress?

A

One of the 3 stresses acting alone

20
Q

What is unit stress?

A

The amount of deformation on one dimension of a body compared to the original dimension’s size

21
Q

What is poisson’s ratio?

A

Negative ratio of lateral strain and longitudinal unit strain for a material under longitudinal stress within the proportional limit

22
Q

What is the elastic limit?

A

The point where a material can be deformed up to before it will no longer return to its original shape

23
Q

What is the yield point?

A

The maximum stress before permanent deformation

24
Q

What is a ferrous material?

A

A material containing iron

25
Q

What is non ferrous?

A

A metal without any traces of iron

26
Q

What is the ultimate tensile stress?

A

The maximum tensile stress that can be applied before breaking the material

27
Q

What is the breaking point of a sample?

A

Modulus of elasticity:

Ratio of stress and strain

28
Q

3 most important lightweight metals in the industry?

A

Aluminium and their alloys
Titanium and their alloys
Magnesium and their alloys

29
Q

Structure of metals

A

Crystalline

30
Q

Body centred cubic (BCC)

A

9 atoms, one in each corner and one on the centre

31
Q

Face centred cubic

A

14 atom, one in each corner and one in the centre of each face

32
Q

What metals are hexagonal close packed and how many atoms are there?

A 
17 atoms
Cobalt
Magnesium
Titanium
Zinc
33
Q

Best selection of a material

A

Best compromise between cost and properties

Mod 6 (8 decks)

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